VHS\DVD audio problem

[Mekkins]

Ever since I bought my first VHS/DVD player I've had trouble with the DVD sound not being loud enough. My TV audio control goes from 1 to 100 and once I hit about 35 or 40 the sound gets no louder. The VHS player does not have this problem, just the DVD. After I replaced my mother's TV this past Xmas, she had the same problem so I'm guessing, at least in her case, it's the TV causing the problem. Watching TV or a videotape, no problem. Put in a DVD, and the audio will only get so loud and no louder. I initially used a coax cable between the TV and the player until someone suggested I try the AV cable with the red/white/yellow connectors, but that didn't help the problem. Anyone have any ideas?